US20050207326A1 - Dual stack optical data storage medium and use of such medium - Google Patents

Dual stack optical data storage medium and use of such medium Download PDF

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Publication number
US20050207326A1
US20050207326A1 US10/517,472 US51747204A US2005207326A1 US 20050207326 A1 US20050207326 A1 US 20050207326A1 US 51747204 A US51747204 A US 51747204A US 2005207326 A1 US2005207326 A1 US 2005207326A1
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United States
Prior art keywords
thickness
layer
layers
stack
medium
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Abandoned
Application number
US10/517,472
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English (en)
Inventor
Joachim Hellmig
Andrei Mijiritskii
Teunis Tukker
Sjoerd Stallinga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Publication date
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Assigned to KONINKLIJKE PHILIPS ELECTRONICS N.V. reassignment KONINKLIJKE PHILIPS ELECTRONICS N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STALLINGA, SJOERD, TUKKER, TEUNIS WILLEM, HELLMIG, JOACHIM WILHELM, MIJIRITSKII, ANDREI
Publication of US20050207326A1 publication Critical patent/US20050207326A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2403—Layers; Shape, structure or physical properties thereof
    • G11B7/24035—Recording layers
    • G11B7/24038—Multiple laminated recording layers

Definitions

  • the invention relates to a dual-stack optical data storage medium for at least read out using a focused radiation beam with a wavelength ⁇ between 400 nm and 410 nm and an Numerical Aperture (NA) between 0.84 and 0.86, entering through an entrance face of the medium during read out, comprising:
  • the invention also relates to the use of such medium.
  • DVD formats can be divided into DVD-ROM that is exclusively for reproduction, DVD-RAM, DVD-RW and DVD+RW, which are also usable for rewritable data storage, and DVD-R, which is recordable once.
  • DVD formats comprise disks with capacities of 4.7 GB, 8.5 GB, 9.4 GB and 17 GB.
  • the 8.5 GB and, in particular, the 9.4 GB (DVD-9) and 17 GB (DVD-18) formats exhibit more complicated constructions and usually comprise multiple information storage layers.
  • the 4.7 GB single layer re-writable DVD format is easy to handle comparable, for example, to a conventional compact disk (CD) but offers an insufficient storage capacity for video recording purposes.
  • DVR Digital Video Recording
  • DVR-red formats are currently being developed: DVR-red and DVR-blue, the latter also called Blu-ray Disc (BD), where red and blue refer to the used radiation beam wavelength for recording and reading.
  • BD Blu-ray Disc
  • This disk overcomes the capacity problem and, in its simplest form, has a single storage layer format which is suitable for high density digital video recording and storage having a capacity above 22 GB in the DVR-blue format.
  • the DVR disk generally comprises a disk-shaped substrate exhibiting on one or both surfaces an information storage layer.
  • the DVR disk further comprises one or more radiation beam transmissive layers. These layers are transmissive to the radiation beam that is used to read from or write into the disk. For example a transmissive cover layer, which is applied on the information storage layer.
  • a transmissive cover layer which is applied on the information storage layer.
  • NA numerical aperture
  • the substrate when using disks that are recorded and read out with a high NA, focusing onto a recording layer of a first recording stack, is performed from the side opposite from the substrate. Because the first recording layer has to be protected from the environment at least one relatively thin radiation beam transmissive cover layer, e.g. thinner than 0.5 mm, is used through which the radiation beam is focused. Clearly the need for the substrate to be radiation beam transmissive no longer exists and other substrate materials, e.g. metals or alloys thereof, may be used.
  • a dual-stack optical storage medium has two reflective information layers, that are read-out from the same side of the medium.
  • a radiation beam transmissive spacer layer is required between the recording stacks.
  • the first recording stack must be at least partially transparent to the radiation beam wavelength in order to make reading from the recording layer of the second recording stack possible.
  • the thickness of such spacer layers typically is thicker than 30 ⁇ m.
  • the radiation beam transmissive layer or layers which are present between the radiation beam source and the recording stack that is most remote from the substrate are normally called cover layers. When prefabricated sheets are used as transmissive layers extra transmissive adhesive layers are required in order to bond cover layers to each other.
  • the variation or unevenness of the thickness of the radiation beam transmissive layers over the radial extension of the disk has to be controlled very carefully in order to minimize the variation in the optical path length for the impinging radiation.
  • the optical quality of the radiation beam at the focal point in the BD or DVR-blue version which uses a radiation beam with a wavelength substantially equal to 405 nm and an NA substantially equal to 0.85, is relatively sensitive to variations in the thickness of the transmissive layers.
  • the total layer thickness has an optimal value in order to obtain minimum optical spherical aberration of the focused radiation beam on, e.g., the first information recording layer.
  • a deviation e.g.
  • an optical data storage medium which is characterized in that the spacer layer has a thickness selected from the range 20-30 ⁇ m, the thickness d TS0 in dependence on the refractive index n TS0 is within the upper shaded area in FIG. 1 and the thickness d TS1 in dependence on the refractive index n TS1 is within the lower shaded area in FIG. 1 .
  • the specifications of the Transmission Stacks (TS) include all possible layers on top of the concerning recording stack, such as e.g. gluing layers in case of foils, the spacer layer and the semi-transparent recording stack of L 1 in case of TS 0 , the Cover Layer and possibly a Protective coating).
  • EP-A-1047055 it is known to use a polymer layer such as, for example, a polycarbonate (PC) sheet as light-transmissive cover or spacer layer and adhere such layer to the information storage layer by means of a thin, spin-coated layer of a UV curable liquid resin or a pressure sensitive adhesive (PSA).
  • a polymer layer such as, for example, a polycarbonate (PC) sheet
  • PC polycarbonate
  • PSA pressure sensitive adhesive
  • the spacer layer thickness or the amount of separation of the first information and the second information layer depends on the size of the photo-detector in the optical pick-up unit (OPU) of the optical medium drive, the magnification from the photo-detector to the medium, the reflectivity ratio of the first and second information layers and the distance between the two layers, i.e. the thickness of the spacer layer.
  • OPU optical pick-up unit
  • Tolerance for aging and alignment errors require a minimum detector size of 100 ⁇ m and a magnification of about 10.
  • the main influence comes from reduction of the signal modulation resulting in a decrease of the signal to noise ratio ( FIG. 3 ).
  • the amount of stray-light as function of the spacer-layer thickness is simulated using ray tracing ( FIG. 4 ).
  • the maximum deviations of d TS0 and d TS1 from respectively the average values of d TS0 and d TS1 between a radius of 23 mm and 24 mm of the medium do not exceed ⁇ 2 ⁇ m measured over the whole area of the medium.
  • n TS0 and n TS1 both have a value of 1.6 and the following conditions are fullfilled: 95 ⁇ m ⁇ d TS0 ⁇ 105 ⁇ m and 70 ⁇ m ⁇ d TS1 ⁇ 80 ⁇ m.
  • Most plastic materials used as transparent layers have a refractive index of 1.6 or substantially close hereto. In this case reliable read out is possible when the thicknesses fall within the mentioned ranges.
  • one method of manufacture comprises the application of a pressure sensitive adhesive (PSA) with a predetermined thickness which is UV-cured after being brought in contact with other layers of the medium.
  • PSA pressure sensitive adhesive
  • This material is usually supplied as a sheet of foil with the PSA on one or sides and those sheets are made with a predetermined thickness.
  • FIG. 1 shows the allowable area of thickness of the transmission stacks TS 0 and TS 1 as a function of the refractive index.
  • FIG. 2 schematically shows the layout of a dual-stack recording medium according to the invention.
  • FIG. 3 shows a simulation of data-to-clock jitter when read out as function of the stray-light from the adjacent, out-of-focus, information layer.
  • FIG. 4 shows a ray-tracing simulation of the light reflected onto the photo-detector as function of the spacer-layer thickness.
  • the allowed thickness ranges of TS 0 and TS 1 are indicated.
  • the thickness d TS0 in dependence on the refractive index n TS0 is within the upper shaded area 1 and the thickness d TS1 in dependence on the refractive index n TS1 is within the lower shaded area 2 .
  • the spacer layer 24 ( FIG. 2 ) has a thickness selected from the range 20-30 ⁇ m.
  • FIG. 2 an embodiment of the dual-stack optical data storage medium 20 according to the invention is shown.
  • a focused laser beam 29 with a wavelength ⁇ of 405 nm and an Numerical Aperture (NA) of 0.85 enters through entrance face 26 of the medium 20 during read out.
  • a substrate 21 made of polycarbonate has present on a side thereof: a first stack of layers 22 named L 0 comprising a first information layer, a second stack of layers 23 named L 1 , comprising a second information layer.
  • L 1 is present at a position closest to the entrance face 26 and L 0 is present more remote from the entrance face 26 than L 1 .
  • SD 694 made by DIC is present between L 0 and L 1 .
  • a transparent cover layer 25 is present between the entrance face 26 and L 1 and may be made of the same material or a sheet of PC or PMMA with a pressure sensitive adhesive USA).
  • the spacer layer may also be a sheet combined with PSA.
  • the L 1 stack 23 has a relatively low thickness of a maimally a few hundred nm the influence of which may be neglected. Naturally L 1 does affect the optical transmission but this aspect is not dealt with here.
  • the transmission stack named TS 1 has a thickness d TS1 of 75 ⁇ m and an effective refractive index n TS1 of 1.6 and contains all layers between L 1 and the entrance face ( 26 ).
  • the spacer layer ( 24 ) has a thickness of 25 ⁇ m.
  • the modeled data-to-clock jitter in % when reading the first information layer of L 0 , as function of the stray-light from the out of focus layer, e.g. the second information layer of L 1 , is represented by graph 30 .
  • the jitter without stray-light was chosen to be 5.8%.
  • the jitter has increased from 5.8% to 6.5% which is tolerable.
  • FIG. 4 the ray-tracing simulation of the light reflected onto the photo-detector as function of the spacer-layer thickness is represented by graph 40 .
  • a 15% upper limit on the stray-light is represented by dotted line 41 .
  • the stray-light as function of the spacer-layer thickness was calculated for a OPU detector size of 100 ⁇ m and a magnification factor of 10.
  • the minimum spacer layer 24 ( FIG. 2 ) thickness to guarantee less than 15% stray-light is 20 ⁇ m.
  • a dual-stack optical data storage medium for read out using a focused radiation beam with a wavelength of 400-410 nm and a Numerical Aperture (NA) of 0.84-0.86.
  • the medium has a substrate and a first stack of layers named L 0 comprising a first information layer and a second stack of layers named L 1 , comprising a second information layer.
  • a radiation beam transparent spacer layer is present between L 0 and L 1 .
  • a transmission stack named TS 0 with a thickness d TS0 and an effective refractive index n TS0 contains all layers between L 0 and an entrance face of the medium.
  • the spacer layer has a thickness selected from the range 20-30 ⁇ m, the thickness d TS0 in dependence on the refractive index n TS0 and the thickness d TS1 in dependence on the refractive index n TS0 are within a specified area. In this way a reliable read out of both the first and the second information layer of respectively L 0 and L 1 is achieved.

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  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Holo Graphy (AREA)
  • Automatic Disk Changers (AREA)
  • Liquid Crystal (AREA)
  • Optical Integrated Circuits (AREA)
US10/517,472 2002-06-14 2003-06-11 Dual stack optical data storage medium and use of such medium Abandoned US20050207326A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02077441.0 2002-06-14
EP02077441 2002-06-14
PCT/IB2003/002570 WO2003107338A1 (en) 2002-06-14 2003-06-11 Dual stack optical data storage medium and use of such medium

Publications (1)

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US20050207326A1 true US20050207326A1 (en) 2005-09-22

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US10/517,472 Abandoned US20050207326A1 (en) 2002-06-14 2003-06-11 Dual stack optical data storage medium and use of such medium

Country Status (17)

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US (1) US20050207326A1 (ja)
EP (2) EP1770698A1 (ja)
JP (1) JP4342439B2 (ja)
KR (1) KR100987660B1 (ja)
CN (2) CN101127223A (ja)
AT (1) ATE350749T1 (ja)
AU (1) AU2003241114A1 (ja)
CA (1) CA2488825C (ja)
CY (1) CY1107587T1 (ja)
DE (1) DE60310933T2 (ja)
DK (1) DK1516323T3 (ja)
ES (1) ES2279116T3 (ja)
MX (1) MXPA04012118A (ja)
PT (1) PT1516323E (ja)
SI (1) SI1516323T1 (ja)
TW (2) TWI369679B (ja)
WO (1) WO2003107338A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060120259A1 (en) * 2004-12-06 2006-06-08 Toshihiro Sugaya Optical disc, optical disc apparatus, and optical disc reproducing method
US20060179448A1 (en) * 2004-12-23 2006-08-10 Smith Wayne M Multilayer dual optical disk
US20100195474A1 (en) * 2008-07-31 2010-08-05 Masahiko Tsukuda Optical information recording medium and recording and reproduction apparatus

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9029028B2 (en) 2003-12-29 2015-05-12 Honeywell International Inc. Hydrogen and electrical power generator
JP4341505B2 (ja) * 2004-08-19 2009-10-07 ソニー株式会社 多層光情報記録媒体
US7976971B2 (en) 2006-05-11 2011-07-12 Honeywell International Inc. Power generator with a pneumatic slide valve
US7713653B2 (en) 2006-10-06 2010-05-11 Honeywell International Inc. Power generation capacity indicator
US9276285B2 (en) 2008-12-15 2016-03-01 Honeywell International Inc. Shaped fuel source and fuel cell
US8932780B2 (en) 2008-12-15 2015-01-13 Honeywell International Inc. Fuel cell
US8246796B2 (en) 2010-02-12 2012-08-21 Honeywell International Inc. Fuel cell recharger

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6246656B1 (en) * 1997-04-25 2001-06-12 Sony Corporation Reduced thickness of a light transmissive layer for a high density optical disc
US20010030932A1 (en) * 2000-02-23 2001-10-18 Spruit Johannes Hendrikus Maria Rewritable data storage medium
US20020110067A1 (en) * 2000-12-28 2002-08-15 Tetsuya Kondo Information recording medium, reproducing apparatus thereof and recording apparatus thereof
US20030058777A1 (en) * 2000-10-27 2003-03-27 Martynov Yourii V. Optical scanning device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001026106A1 (en) * 1999-10-04 2001-04-12 Koninklijke Philips Electronics N.V. Optical recording medium comprising a gesbte recording layer
JP2001307381A (ja) * 2000-04-24 2001-11-02 Sony Corp 光学記録媒体
TW575873B (en) * 2000-07-13 2004-02-11 Matsushita Electric Ind Co Ltd Information recording medium, method for producing the same, and recording/reproducing method using the same
AU2001292284A1 (en) * 2000-10-03 2002-04-15 Matsushita Electric Industrial Co., Ltd. Optical information recording medium, optical information recording/reproducing method, and optical information recording/reproducing device
CN1352456A (zh) * 2001-11-30 2002-06-05 清华大学 具有多层可重写相变记录层的多层多阶光盘

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6246656B1 (en) * 1997-04-25 2001-06-12 Sony Corporation Reduced thickness of a light transmissive layer for a high density optical disc
US20010030932A1 (en) * 2000-02-23 2001-10-18 Spruit Johannes Hendrikus Maria Rewritable data storage medium
US20030058777A1 (en) * 2000-10-27 2003-03-27 Martynov Yourii V. Optical scanning device
US20020110067A1 (en) * 2000-12-28 2002-08-15 Tetsuya Kondo Information recording medium, reproducing apparatus thereof and recording apparatus thereof
US7133331B2 (en) * 2000-12-28 2006-11-07 Victor Company Of Japan, Limited Recording medium having a substrate containing microscopic pattern of parallel groove and land sections and recording/reproducing equipment therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060120259A1 (en) * 2004-12-06 2006-06-08 Toshihiro Sugaya Optical disc, optical disc apparatus, and optical disc reproducing method
US20060179448A1 (en) * 2004-12-23 2006-08-10 Smith Wayne M Multilayer dual optical disk
US20100195474A1 (en) * 2008-07-31 2010-08-05 Masahiko Tsukuda Optical information recording medium and recording and reproduction apparatus

Also Published As

Publication number Publication date
EP1516323A1 (en) 2005-03-23
TW200406748A (en) 2004-05-01
WO2003107338A1 (en) 2003-12-24
DE60310933D1 (de) 2007-02-15
EP1516323B1 (en) 2007-01-03
TWI369679B (en) 2012-08-01
ATE350749T1 (de) 2007-01-15
DK1516323T3 (da) 2007-05-14
CY1107587T1 (el) 2013-03-13
JP2005530290A (ja) 2005-10-06
PT1516323E (pt) 2007-04-30
CA2488825A1 (en) 2003-12-24
CN100444261C (zh) 2008-12-17
CN101127223A (zh) 2008-02-20
DE60310933T2 (de) 2007-10-25
EP1770698A1 (en) 2007-04-04
MXPA04012118A (es) 2005-04-19
TW200746129A (en) 2007-12-16
AU2003241114A1 (en) 2003-12-31
CA2488825C (en) 2012-04-10
TWI303815B (en) 2008-12-01
KR100987660B1 (ko) 2010-10-13
KR20050016549A (ko) 2005-02-21
SI1516323T1 (sl) 2007-06-30
ES2279116T3 (es) 2007-08-16
CN1659644A (zh) 2005-08-24
JP4342439B2 (ja) 2009-10-14

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Owner name: KONINKLIJKE PHILIPS ELECTRONICS N.V., NETHERLANDS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HELLMIG, JOACHIM WILHELM;MIJIRITSKII, ANDREI;TUKKER, TEUNIS WILLEM;AND OTHERS;REEL/FRAME:016720/0836;SIGNING DATES FROM 20040112 TO 20040113

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION